Asterism

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Science and technology

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What Wikipedia says

An asterism (from Ancient Greek ἀστήρ (astḗr) 'star' and -ism) is a star-shaped concentration of light reflected or refracted from a gemstone. It can appear when a suitable stone is cut en cabochon (i.e. shaped and polished, not faceted).

Excerpt from the Wikipedia article “Asterism (gemology)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Didier Descouens, CC BY-SA 3.0, via Wikimedia Commons.